Revert "emulation: Make clear compatible with xterm, don't add lines to scrollback"
Revert "emulation: Make clear compatible with xterm, don't add lines to scrollback"

This reverts commit 450bf257266c1ec0f380e88a5512743acc6fc863.

https://bugzilla.gnome.org/show_bug.cgi?id=747191

rvu95/vte,flaxandteal/gasket-vte,saitoha/vte-sixel,rvu95/vte,saitoha/vte-sixel,thestinger/vte-ng,rvu95/vte,thestinger/vte-ng,flaxandteal/gasket-vte,saitoha/vte-sixel,flaxandteal/gasket-vte,flaxandteal/gasket-vte,thestinger/vte-ng,rvu95/vte